Heating torch



July 5, `1932. G.4 HAMMON HEATING TORCH Filed Nov. 5. 1930 'Iliff/l @uw N h l AT ORNEY.

I W bh WN NN mn. -o-- o. al 1T. s w NmIIIH Patented July 1932 unen-STATES PATENT OFFICE GEORGE L. HAMMON, OF SAN FRANCISCO, CALIFORNIA, .ASSIGNOR T NATIONAL WELD- ING EQUIPMENT COMPANY, INCORPORATED, OF SAN FRANCISCO, CALIFORNIA HEATING TORCH Application le. November 5, 1930. Serial No. 498,542.

lThis invention relates to improvements in heatin torches, or blowpipes, and more particulary to the control of the heating flame in the e-oi torch in which gas and compressed air are used, and it also relates specifwa Y nother object is to produce "a torch in which the heating flame can be regulated by the hand in which it is held, so that alight' or brush ame can be changed instantly concentrated flame of intense heat.

Another object is construction of the noztoa l zle havin multiplel concentric heating and igniting ames to provide a wide variation of flames without lowing out.

Another object is to provide a. gas and air mixer in the regulator body, and tubular connections to the nozzle.-

.Another obj ect is the use of a central tube connected to the mixer and terminat in a chamber in the nozzle, said chamber elng connected to all the concentric chambers.

Another object is the'provision of an 1n. termediate support for the central tube wlthout unduly obstructing the passage of gas 1n the outer tube.

Other objects will appear to those skllled in the construction of torches of this'type, as'

the description progresses.

An embodiment of the invention is shown in the accompanying drawingin which the same reference numeral is applied to the same portionthroughoutrthe several views, and of which there may be modifications:

Fig. 1 is a side elevation of the complete torch, broken away in part.

Fig. 2 is av plan view of the complete torch.

Figl 3 is an enlarged view partly in section of the torch. l

Fig. 4 is an enlarged section taken on line 4-4 of Fig. 3.

Fig. 5 is an enlarged sectional view of the fuel mixer, detached.

Fig. 6 is an end view of tip end of Fig. 3 showing lconcentric chambers and openings.

Fig. 7 is perspectivey of the-end portion of the central tube in aY modified form.

IThe numeral 1 indicates the regulator body Vwhich has the gas connection. 2 and the air .connection 3 t0 which the terminals 4 and 5 having iexible tubes (not shown) are attached. AThe compressed air port 6 leads to a port 7 at right angles to port 6 and that port is connected to the chamber 8.

A needle valve 9 closes the passage way between ports 6 and 7 and it has the threaded stem 10 on which is fixed the knurled wheel 11 to control the needle valve.

The gas port 12 leads to a port 13 controlled by the needle valve 14 which has the threaded stem 15, on which is fixed the knurled control wheel 16.

The port 13 leads to the annular channel 17 in the mixer body 18.

The mixer has the central opening 19, and small holes 20, leading from the channel 17 to the chamber 8.

Connected to the mixer is the outer extention tube 22, by means of the threads 23 and a central tube 24 is connected to the mixer by t the threads 25.

The mixer and extention tubes are held in place by the threaded coupling nut 2 6.

The tubes 22 and 24 are of suitable length and may be curved to suit the work being done, in the present instance straight tubes aie shown, on which is mounted the nozzle 2 The nozzle is connected to the tube 22`by means of the bushing 28 which is threaded on at 29. External threads 30 on the bushing engage threads on the nozzle 27.

varound the central tube, and the concentric 40 forming the'concentric chambers 41 all 421. I

The bushlnghas. the radial slots 32 which communicate Chamber 39 has the holes 43 to the chamber 36.

Chamber 41 has the holes 44 to the chamber 36 and chamber 42 has the holes 45 to the chamber 36, chamber 36 gets gas mixture from chamber 34 through plurality of slots 32.

A spiral spring 47 acts as a support for the central tube 24, to hold it central and allow a free flow of the gas mixture.

'In the regulator, the valve 48 closes the opening 19 to the .chamber 8, and this Valve has the stem 49 extending outside of the body, a spring 50 acts to hold the valve seated, suitable packingl is provided for the stem. On the outside of the body is the bell-crank thumb lever 52 pivoted at 53 and it has the Vertical depending members 54 and 55, one on each side' of the valve stem. These members act against the adjustable collar 56, to move the valve oli its seat. A lo'ckrnut 57 holds the collar in adjustment.

In the operation of the heater, connection having been made with a source of supply of gas and compressed air, the needle vvalve 14 is adjusted to admit gas to the mixing channel 17 where it whirls around and is cut through at right angle, by air jets from the openings 20chamber 8, and port 7 cont-rolled by the needle Valve 9i. As the gas and air so are mixed the mixture passes through the holes 58 to the annular chamber 34, from y/there through the slots 32 to the chambe-r 36, to central tube 37, through holes 43 to concentric chamber 39, through holes 44 to concentric chamber 41 and through holes 45 to concentric chamber 42. At this stage, the central flame, and all of the concentric iames are burnin whichA results in a long brush. like llame or moderate heating..

pull back the valve 48 and allow a consi der through the central tube, which acts to inspirate more gas from chan'iber 36 through the central orilice ot the tip thus restricting the mixture passing through the amount o1: the outer chambers and thus cutting down the concentric :dames surrounding the central tube at the nozzle, with the resu t that a shorter and intensely hot flame is produced which can be further regulated by the needle valves. j

The action of the mixture passing across the space between the'end of tip 35 and the tube 37 is to draw the mixture Jfrom the concentric chambers and thus further concen tratethe central llame. A

As soon as the lever is released the spring 50 closes the valve 48 and the brush flame returns.

The needle valves, and the lever are operated by the fingers of the hand that holds the torch.

Having thus described my invention what I desire to protect by Letters Patent ot the Now, when the lever 5,2 is pressed, it acts to "United States is as follows, but modiication may be had in carrying out the invention as shown in the accompanying drawing and particularly described form ther-eci' within ,w the purview of the annexed claims. l@

il cla-iin:

l. A heating torch comprising a torcia body, means to mix air and gas in said body, a llame nozzle for said torch, means to distribute a certain amount of said mixture to said nozzle to produce a moderate .heating lame, means to regulate said distributing means, an auxiliary means -for admitting additional air to produce an intense heating flame, and automatically reduce said modere ate heating flame.

2. A heating torch comprising a regulating body, a flame nozzle connected to said body,

a gas and air mixer in said regulating body,

a central passage from said mixer said nozzle, a passage concentric to the central sage from themixer to the nozzle, a plurality' of concentric chambers in said nozzle, means to control the-gas mixture in said passages to produce a central llame and a plurality ot llames concentric to said central flame, and moans to concentratethe flames to a central flame of'intense heat, by the admission of compressed air to the central passage.

3. A heating torch comprising a regulator body, means to supply gas and compressed air to said body. a mixer for said gas and air in said body, a flame nozzle, means to connect the nozzle to said mixer, means to control the llow of gas and air separately to said mixer, and auxiliary means to allow compressed air to flow to the central portion of said nozzle.

4. A heating torch of the class described comprising a regulator body, means to conneet said body to sources of fuel gas comchamber, Valves to open or ci ways, a chamber to receive passage adjacent said mixin nozzle having a central passage y chamber, a Valve to open or clos' tion between the chamber and the c sageway, means to operate said Vai i the outside of said regulator body. and a sageway from said mixing chamber said nozzle.

5,. A heating torch o3t` the class described comprising a regulator body, a detachable air and gas mixer in said body, a conical face on o f. MISC, y

said mixer, a seat in said dy `for said a tube attached to said mixer, a coupling to secure said tube and mixer in the body, smaller tube mounted inside-.said ltube and connected to the mixer, a nozzle mounted on the outer end of said tube, a chamber in said nozzle, into which the end of said smaller tube projects, ports adapted to conduct air and gas to said mixer, Valves for controlling said ports, an air chamber communicating with said'mixer, an opening from said chamber to the smaller tube, a valve adapted t close saidopening, and means to o crate said valve from the outside of said bo y.

6. A heating torch nozzle comprising. a

.plurality of concentric chambers, open at the ture chamber, means to blow fuel mixture a passageway from the mixerto the nozzle through said'chamber and thus through the .concentric chambers, and means to blow a fuel mixture through the central tube. d

7 A heating torch lhaving a regulator body, compressedair and gas connections on said body, a nozzle, a mixerin said nozzle, a gas and air mixer in said body, a central opening through the mixer to the nozzle mixer,

anixer, an air-'chamber communicating with the central opening in said bodyfavalve to open or close said opening, a port leading from the air connection to said chamber, a valve in said port, `a port leading from the gas connection to the mixer, a valve in said ing through the mixer to the nozzle mixer, to the air chamber, and means to operate all of said valves from the'outside of the regulator body.

8. A torch of the class described comprising a regulator vbody, an air chamber insaid body, a valve controlled port leading to said chamber, a mixer member adapted to close one end of said chamber, small openings into the mixer from the chamber, a central opening through the mixer, a valve adapted to close said opening into the chamber, a stem l xed to said valve, and extending outside of said body, collars on the free end of said stem, a pring adapted to hold the valve closed, a be crank thumb lever pivoted on the outside of said body and having forked. members adapted to engage the'collar on said stem whereby the pressing down of the thumb lever will move the valve and open the'cenend of said small tubehaving a reduced openi ing, a central tube in the nozzle communicating with the mixing chamber and in alignment with the opening in 'said nipple, but spaced therefrom, and a valve adapted to admit air to the central opening. l

l0. A heating torch of the class described comprising a regulator body having gas and compressed air connections and ports, a compressed air chamber, a valve to control the supply of air thereto, a central tube leading from said chamber, a valve to close the outlet of said tube from the chamber, means to operate said outlet valve from the outside of saidl regulator body, a fuel mixture chamber, a valve to control the supply of fuel to said chamber, small openings connecting said fuel chamber with said compressed air chamber, an outside tube forming a passageway around the central tube and leading from said fuel mixture chamber, a nozzle 'on said outside tube, a :Euel mixture chamber in said nozzle, a series of concentric chambers having openings to said mixture chamber, a short tube connected 'to the mixture chamber in alignment with said central tube, but spaced from the end thereof, means to supply the concentric chambers and short tube with fuel mixture to produce am'oderate heating flame,

centric dames.

GEORGE L. HAMMON.

tral opening to the chamber, a nozzle having a central opening in alignment with said centml-opening and -aplurality of concentric chambers in saidinozzle connected to the mixer.

' 9. A torch of the class described compris- I `ing a regulator body having gas and compressed air connections and ports, valves to control said gas and air, an extension tube,

a mixer mounted on said tube, means to attach said mixer and tube tosaid body a nozzle mounted on the other end lof said tu Y a-mixingrvchamber in said nozzle a central opening through said mixer in said body, a

small tube in said opening extendin to the mixing chamber in said nozzle, a nipp e the lee 

